oidium
noun
one of the conidia that are borne in chains by certain fungi.
The grammatical form denoting more than one person, place, thing, or idea.
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The oidia of Erysipheae contain fibrosin bodies and the hyphae of Saprolegnieae cellulin bodies, but starch apparently never occurs.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 "Frost" to "Fyzabad" by Various